Overtraining is what killed my college cross/track career. It used to be all negative splits, 70 mile weeks, lots of intervals, etc. 6-7 days/week of hard workouts and races from 800m to 10 miles, but now I can barely get motivated to train at all.
now:
monday-tuesday: 2-3 PBRs/night
Wednesday: micro night
thurs: 2 Deschutes
Fri: drive to trailhead or crag. 1-3 tall boys.
sat-sun: SEND!
* I do walk a couple miles each day to/from work, uphill both ways (it is possible), but the best training for climbing is climbing, oh and doing lots of (liquid) carbo loading.